Current square switching circuit system

The invention discloses a current square switching circuit system. A current square switching circuit comprises a fixed voltage generating circuit and a current square circuit; the fixed voltage generating circuit comprises a fixed voltage output end and a circuit output end, and is used for providing fixed voltage for the current square circuit; the current square circuit is connected with the fixed voltage generating circuit, and a square relationship is formed between an output current and an input circuit of the current square circuit. In the embodiment of the current square switching circuit system, the fixed voltage generating circuit is composed of two P-type field effect transistors and used for providing the fixed voltage for the current square circuit, the current square circuit is composed of three P-type field effect transistors, and finally, the current is output with a set of current mirrors. The current square switching circuit system is simple in circuit structure and small in chip area, and the standard CMOS technology is adopted.